Wilhelm carl globing



vv. 0. .FL'O'RING.

ELECTRIC FUSE 0R CUT-OUT.

APPLICATION FILED DEC.2, 1913.

1,325,562, Patented Dec. 23,1919.

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WL'ZWQJJani V V h I I o washer; Fig. 8 is a view of i WILHELM om iii-came, or NEW YORK, N. Y.

ELECTRIC FUSE OR CUT-OUT.

Specification of Letters Patent.

Application filed December 2. 1913. Serial No. 804.210.

To all whom it may concern":

Be it known that I, WILIIELM CARL FLoR- ING, of New York city, State of New York, have invented new and useful Improvements 5 in Electric Fuses or Cut-Outs, of which the following is a specification.

My invention relates to that class of fuse cut outs which are commonly called plug fuses, and particularly to that character of such devices, wherein an outer conducting casing, inclosing a non-conducting element containing-a fusible medium, is attached to a socket carrying terminals for the line wires.

' An object of the invention is the provision of a substantial and reliable plug fuse that.

may be readily taken apart in order to use the elements over, again after the blowing of a fuse, and tomake a good electrical connection of the fusible element, and also to provide means for easily observing the con dition of the latter by the entrance of the light from top and s1des of the plug fuse upon said fusible element when the plug is in position in a socket of the ordinary cut out. A further object-of the invention is a combination of socket and plug that shall preserve the metal shell and center contact of the line socket, guarding them against deterioration or burning out by heavy arcing, and also resides in other details of con- 'struction; and it consists in novel devices and combinations of devices as hereinafter set forth. 7

In the accompanying drawings, Figure 1 is a partly sectional new of my plu fuse inserted in a socket disclosing the sible element as seen when looking across the sides and above the rim of the socket; Fig.

L 2 is a top plan view of the outer casing containing the inner receptacle; Fig. 3 is a bottom vlew of the said casingA and receptacle; Fig. 4 is a plan view of t is a side view of the same;'Fig. 6 is a cross section thereof; Fig. 7 is a view partly in section of the outer casing showing the fusible element above the rim of a socket and also illustrating my spring washer spread out; Fig. 7 is a plan viewof my spring a. blank of my fusible element; Fig. 9 is another view of the same with the ends bent; Fig. 10 is a plan view of my protective strip; Fig. 11 is a plan view of my non-conductive or dielec- 5 tric material; Fig. 12 is another view of my e latter; Fig. 5

receptacle shown in elevation; Fig. 13 is a plan view of my mica blank, Fig. 14 1s a view in detail of my metal cap; Fig. 15 is another view of the same showing in dotted lines an indentation in it; Fig. 16 illustrates in detail the upper part of the fuse element 10 shown in Fig. 6; Fig. 17 is a sectional View showing a modification of the structure illustrated in Fig. 7 disclosing a. different form of contact between the outer casing and the screw shell of the line socket; Figs. 18 and 19 are partly sectional views of other details of construction of my receptacle; Fig. 20 is a plan view of a detail of the cover of the inner casing; Fig. 21 illustrates a cap crimped around the neck of a bottle-shaped glass cup; and Fig. 22 is substantially a plan view of my blank formed by a combination of the principal features of the fusible material shown in Fig. 8 and my protective strip illustrated in Fig. 11.

Referring particularly to the drawings, 2

suitable non-conducting material, as for'example, porcelain, fiber or molded mica, and comprises an interior open portion 22, a rece'ss or depression 27 in the lower face of the same, and an orifice 21 communicating with the last two named open spaces. The receptacle or casing 5 is ordinarily made with two flat sides 6 and 7 to form a clearance between the same and the casing Land to reduce the wall thickness and thereby increase the transparency of the same, in which sides are preferably formed laterally disposed openings 8 and 9, and on the riphery of the casing intermediate the said openings are two located a recess and a channel or notch 26. The saidinner receptacle or'casing is also provided in ordinary cases with an axial depending lug or teat 24 in one of the sides of which 1s preferably formed a recessed portion or indentation 39.

One object of having the sides 5 and 6 fiat, as stated, is that to those versed in the art of molding articles, such as my receptacle, it is well known that in order to get the moist substance that is afterward baked easily out of the mold there should be no Patented Dec. 23, 1919. I

suction, and that sides perpendicular to the lower surface, and all side pulls for forming side recesses or the like, should be voided if possible. These inconveniences I avoid by using the said flat sides and by forming the hole 21, the recess 39 and the recess 27 so that my receptacle may be extracted from the mold by a. straight pull.

The electrical connections of the interior cup-shaped receptacle 5 are made in the following manner. A metal cap 2a which forms one terminal of the same is placed over the lug 2i and has an extension 23 adapted to fit over the bottom of the casing above the depending lug it. The top of the receptacle is covered with a non-conducting transparent material, as a flattened (1151: 18 of mica, and a strip of gelatin 1?, over which is placed a plate 10 preferablymade of fusible alloy metal or lead, according to the desired carrying capacity thereof, and

' having a perforated body portion and an extension 10 which is bent over and under the said transparent elements 17 and 1S and passes through the notch 26 into the interior of the receptacle where it is soldered to the extension 23 of the cap 2i, after which the said metal cap is drawn up to the lug 2 and the extension 10 of the fuse and the extension 23 are passed through the eccentrically located orifice 21 and the said extension is then bent over upon the upper face of the bottom of the said receptacle. The cupshaped cap 24; is preferably dented into the recess 39 of the lug 24: as shown in dotted lines at 41. I The side portions of the gelatin strip 1? are bent over the receptacle, as on the line 19, and the same are held in position by the extended portions or tongues of the protective strip 11 which has a central opening 13 to register with the interior open portion 22 of the body of the fuse receptacle and openings 12 and 14: adapted, when the sides of the strip 11 are bent on, the line 20, to enter the spaces afforded by the flat sides (3 and 7, to register with the openings 8 and 9 of the receptacle, the extreme ends of the said strip being bent up, as at 28, and constructed and arranged to be bent or sprung inwardly so as to enter the recess 27 formed in the bottom of the casing 5, after which the recess 27 may be filled with a suitable cement to seal the bottom of the receptacle in the ordinary manner. The said strip 11 also has a plurality of-bent over portions as lips or extensions 15 and 16 which are respectively engaged with the recess 25 and notch 26, which extensions may entirely surround the periphery of the contact face 30 of the strip and be pressed inwardly or as represented at 15 in Fig. 19. The face 30 may be left wide enough for a bead to lie over the head of the casing and this bead crimped in as shown in Fig. 21. The object of constructing the bottom part of the receptacle with the depending portion '24: and the recess 27 is to provide space for turning in the ends 28 without coming too near the metal cap 2i, and also to prevent the receptacle from being unduly long or high.

In instances where higher capacity fuses are used I may dispense with the body 10 of the fuse and use in lieu thereof an extension 10 of the strip 11 which, in such cases comprises the fusible material and is preferably made of tin, the end of the extension 10 being soldered to the extension 23 of the metal cap 2i. The strip 11 is further provided with a. spring 36. A continuous electrical connection is established between the cap Ql up and through the fuse element 10 or 10 and the outer flat contact face 30 of the metal strip 11 or 11''.

I provide an outer or inclosing metallic casing 1 for the fuse-containing slidable inner receptacle 5 comprising a threaded portion 31 and an enlarged upper part 32, to provide a hollow portion '40, and made with a central orifice 33 constructed and arranged to register with the opening 13 and sur rounded by an offset 34, and also having apertures 33 normally in alinement with the openings 12 and 14, a good contact being insured between the inner face 35 of the outer casing and the face 30 of the inner receptacle by means of the spring washer 36 lying over the upper part of the element 5, to afford a resilient pressure contact between the same and the outer casing, and consequently between the elements 3 and Q4. Heretofore precautions have been made, in combination with a socket having a center contact and a plug also having a center contact, to keep the two contacts from getting apart in order to prevent heavy arcing by introducing springs at either one or the other of said contacts. I find, however, that by my slidable receptacle-body-arrangement made with a spring pushing the center contact of the plug at all times rather in than out, better results are obtained and the center contact of the more costly socket prevented from melting. Furthermore, with a great number of small arcs occurring in a socket and plug combination, as produced by my springs 36 while the current is being broken, the contact parts last longer than if one heavy arc during current rupture were produced at one place only. In order that free access to the inside of the receptacle from the outer casing is not restricted, I provide the spring 36 with a large center orifice. This resilient washer shown in Fig. 7 which may-be used in lieu of the strap spring 36' shown in Fig. 10, may be bent on the line 37 and inserted between the inner receptacle and outer casing as also illustrated in Fig.

17. In this figure the attachment of the threaded portion 31 is made contrary to carrying a fusible element, is

into the female threads of the same. This has an advantage in that the brass socket shell, which often happens to be exposed to the weather or outside atmosphere, is, by the protective outside casing, not subjected to oxidation which sometimes causes cracking of the metal shell and consequently pool contact, which might occur if the outer casing were screwed into said shell. A further advantage of using an outer casing with .an enlarged diameter for the threaded portion 31" is that large sufficient size for gas expansion, such as shown in Fig. 18 with an extended head 18, may be used therein. The parts 10, used with the depending lips 15 and 1? of Figs. 18 and 19, I designate broadly as a cap. The outer .face of the inclosing casing is ordinarily and preferably provided with a non-conducting adhesive protective covering 49 such as illustrated in Fig. 1 ing enamel applied thereto baked thereon.

In case a fuse blows out, the gases caused thereby fill the interior chamber of the re ceptacle 5 and, as the same can not escape through the bottom thereof, they pass through the channel formed by the notch receptacles made of 26 into the interior of the outer casing being directed circumferentially by the curved extension 16, and they lose their pressure in the enlarged hollow portion 40 of the outer casing.

In Figs. 18 and 19 other tacles made according to my invention are illustrated. In Fig. 18 the inner receptacle 5 is made of spun or stamped metal having an upper bead thereon, and the ring 10 carrying a fusible element is held down by a tin cap 18' having lips 15, 16' turned down on the receptacle. A gelatinband 17 is located under the element 10 and passes around the receptacle and is held in position at the top by the spun lips or beads 15, 16', and at the bot-tom thereof by tie-bands 88 which are passed around the gelatin in groove 43 as indicated by dotted lines. Within the opening 14 and beneath the gelatin, wire gauze 44 of ordinary construe-- tion is located. The lower part of the receptacle'consists of porcelain made like the bottom of the element 5 and having a central depending portion 24 carrying a cap. 24 which is soldered to the fusible element. The said lower part is held to the cylin- 'drical tube 5 by a bead and offset 48 spun around said lower part as indicated, to which part the cap 24 is fastened as shown. In Fig. 19, a clear glass casing 5 is illustrated having a bead 42 and knob-like extensions 4-5 and 46 molded thereon. Across the open mouth of the casin the ring 10, placed. In

styles of recepand compris-' and pre ferably.

cap' 18 having ex be crimped' around the top casing which is illustrated in Fig. 21 where I show a bottle shape. In the bottom this instance, a metal tensions 15 may or head of the in detail at 29 glass casing of of the cup and around the fusible element I preferably place a paper band XA indicating the carrying capacity of the fuse, say 10 amperes.

It will be readily seen that the metal stamping 11' in Fig. 20 which corresponds in some respects with the strip 11 with its perforations 45 and 46 may bebent over the top of part 10 and side projections 45 and 46 as indicated on the receptacle 5 in Fig. 19, similar to these bent over the top in Fig. 12, and that thus, due to the relative thread positions of the projections, a shouldered threaded metal, shell 31 easily put up from below, and electrically connected. to 11' shown. The top line of this shell would come where indicated by the dotted line 50, and all of that portion of the fusible element above that laid open to view.

It is obvious that the threaded part of the outer casing could be flattened out on two opposite sides and these sides come in close proximity with the sides 6 and 7 of the inner receptacle, the advantage of which would be that the opposite sets of openings of the inner and outer casings would respectively remain with their planes at all times parallel to each other. The apertures in the outer casing, which are shown at 33', are cut into the sides of the casing of a height about that of the opening 12 in Fig. 7, but preferably about. twice as wide. If the opposite openings are out of registration, even so much as, or to the extent of, the relative entrance of light to the. sides may be near the parts 45 and 46 as 7 in Fig. 2, yet that light will be sufficient, I

in connection with that passing through the central opening 13, to still examine the fusible element. By the use of my spring 36, any relative position to which the said openings are adjusted will be continuously maintained.

The cap 24 may be held to the projection 24, by merely slipping the cap over the said lug 24, putting the fuse wireinto the groove on said projection, and then soldering the fuse wire to the inside of said cap. I, however, prefer the. first named mode of fastening, as it is more firm and stronger.

Elements of the invention may advantageously be assembled and employed for other uses of plugs, such as attachment plugs, by merely bringing out through the opening 13 of my outer casingf2 electric connections 47 and 47' and attaching the outer ends of the same respectively With a translating device and connecting the inner end of one of nor end of the other one with the extension 23 as shown in Fig. 17

What I claim as my invention is 1. In a device of the class described, a tubular cup-shaped inclosing receptacle, a metal center contact on said receptacle, a slot in said receptacle, a gelatin cover over said slot, a sheet metal strip over said slot and cover, an opening in said strip, a fusible element in electrical connection with the strip and center, contact, and an inclosing casing for the receptacle held in contact with said strip.

2. In a device of the class described, a

tubular cup-shaped non-conducting receptacle, a center contact on the same, a metal outside contact on said receptacle, a fuse located in said receptacle and connected with said center and outside contacts, an opening in said receptacle, a gelatin blank over the opening, a cover to hold the gelatin blank in position, and a casing having a center and a screw-shell contact respectively connected with the first named center and outside contacts.

3. In a device of the class described, a non-conducting cup-shaped receptacle, a center contact on the same, a gelatin strip, an outside metal strip contact on said strip, an opening in the same, lips or extensions thereon having tongues to hold the gelatin strip, a fuse in the receptacle, a recess on the exterior bottom portion of the latter to contain the said tongues to hold the metal strip in position, and an outside metal inclosing casing for said receptacle.

4. In a device of the class described, a casing having a center and screw-shell contacts, a vitreous body having a projection, a metal cup center contact mounted on said projection, a groove in said projection, an indention in the side of the cup bedded in the groove, outside contacting means on said vitreous body, and a fuse electrically joined to said center and outside contacts.

5. In a device of the class described, a receptacle, a projection on the bottom of the same, a metal cap fitting over said projection, an elongation longitudinally extended from said cap terminating at, and bent upon, the bottom of said receptacle, an outside contact on said receptacle, and means of electrically connecting said elongation and said outside contacts.

6. In a device of the class described, an outer casing having a central and a side opening, an inner receptacle or casing also having a side and a central opening, a trans arent coverin for the openings of said atter receptaclle and carried thereby, the centrally disposed opening of the outer casing and the one of the inner receptacle being in alinement with each other, exterior contacts on said inner receptacle, and fusible material in said receptacle to connect the two said contacts, one of said exterior contacts of the inner receptacle being in contact with said outer casing.

7. In adevice of the class described, a line socket, a receptacle having a bottom portion of non-conducting material, an axial depending lug on said bottom, a recessed part on said bottom, a center contact mounted on said lug, an outside contacting means on the receptacle bent around said bottom portion, and a conductor to connect said center contact with said outside contacting means on said receptacle, and also contacting means formed by the outside of the receptacle and the inside of the socket.

8. In a device of the class described, a socket, two conductors, a cylindrical casing adapted to be screwed into the socket, a center contact in said socket, a cylindrical receptacle body slidably arranged in said casing, a center and an outside contact on said body, said last named contacts being insulated from each other, one end of one conductor joined within said receptacle to said center contact, the other conductor end being in electrical connection with said outside contact on said receptacle, a metal spring washer located between said receptacle and said casing adapted by the loosening of said casing in said socket to push said center contact on said receptacle toward said center contact in said socket, and means of connecting said outside contact of said receptacle andsaid casing electrically.

9. In a device of the class described, a fuse element, a screw-shell formed with an outside contact, a tubular receptacle made of vitreous transparent material adapted to contain the fusible element and ofsuch size as to be screwed into and to have its lower portion partially covered by the screw-shell and being of such relative thickness above the screw-shell as to allow the condition of the fusible element contained therein to be observed thereat, and a center outside contact, the fusible element being detachably supported and entirely contained within the open interior chamber of said receptacle, and being connected with the said outside 'contact at one end and at the other extremity with the center contact, whereby the circuit is completed from the screw-shell through the fusible element to the center contact, and whereby in case the fusible element becomes burnt-out the same may be replaced by a new fusible element.

10. In a device of the class described, a line socket, a straight-sided non-conducting receptacle contained therein to allow a clearance at said sides between the two, said receptacle being hollow with one open end comprising a circular wall, the other end being closed by a perforated bottom portion, a slot in said wall running in an axial direction from said open end toward the bottom of the receptacle, a metal center and a metal outside contact on said receptacle, and an electric conductor soldered to the said contacts.

I 11. In a device of the class described, an outer casing having acentral opening, an inner receptacle or casing also having a central opening, the lower portion of said receptacle being of metal and the upper part thereof comprising transparent material, means to hold the said two parts securely together, exterior contacts on said inner receptacle, and fusible material in said receptacle to connect the two said contacts, one of said exterior contacts of the inner receptacle being in contact with said outer casing.

12. In a device of the class described, a non-conducting receptacle formed with a central open portion and an eccentrically located orifice through the bottom of the same, an axial depending lug on said bottom, said orifice terminating in a groove on the side of said lug, a center contact on said depending lug, an outside contact on said receptacle, and means to bring said center and said outside contacts in electrical connection by way of sald groove, said orifice,

and said openportion.

' 13. In combination with a line socket comprising a metal screw-shell and a center contact, the convolutions on said screw-shell forming a male threaded contacting surface on the outside of said shell, a female threaded metal inclosing contact surface upon a metal casing, said casing being adaptedto screw over said line shell and to contact with said outside surface on said line shell, and con ducting means within said outside casin to complete a; circuit from the line screw-s ell to the center contact of the line socket.

14 In a device of the class described, a screw shell, a plug, an interior fuse link, an

aperture in said shell located between the rim of the screw shell and the top of the plug, and a transparent barrier around said link.

15. In a fuse plug, a conducting element having a free end, a hollow casing having a permanently closed end provided with an external projection forming a seat for the conducting element, said closed end being perforated for the passage of the element, the projection extending below the said casing and surrounded by an annular groove adapted to receive the said free end of the element, said passage being at one side of the projection and the groove extending around to the other side thereof.

16. In a fuse plug, a conducting element having a free end, a hollow casing having a permanently closed end provided with an external projection forming a seat for the conducting element, said closed end being perforated for the passage of the element, and having a groove adapted to receive the free end of the element, the said passage being inclined through the closed end toward the longitudinal axial line of the casing, whereby the said element is held from displacement.

17. In a device of the class described, a screw-shell formin an outside contact, a tubular receptacle, a metal covering located at the periphery thereof, a center outside contact, a fusible conductor insaid receptacle, said receptacle being made of vitreous transparent material to show the condition of the fusible conductor, means whereby the said covering may engage the screw-shell at projecting portions in different planes, the electric circuit being completed from said screw-shell through the covering and fusible conductor to the center contact.

18. In a' device of the class described, a receptacle, a projection on the bottom of the same, a metal cap fitting over said projection, a peripheral extension on said cap passing into the interior of the receptacle, an outside contact on said receptacle and a fusible element to electrically connect said extension and said outside contact.

In testimony whereof, I have signed my name to this specification, in the presence of three subscribing witnesses, this 18th day of Sept. 1913.

MAY C. MoGmNnEss, FR. SOHUNEMANN. 

